RainSmart® Drainage Cell

RainSmart® Drainage Cell is a lightweight three-dimensional drainage panel with a high load-bearing capacity, used for subsurface water management.

RainSmart Drainage Cell provides a perfect solution for subsoil drainage and gas collection systems, as well as low impact design and weight sensitive applications such as roof gardens. The drainage cell offers a uniform surface along with an internal void space for effective drainage of excess water. RainSmart Drainage Cell will also provide drainage behind concrete panels, concrete block and timber retaining walls.

The drainage cell system has a unique diamond cup structure. When used in roof garden applications it provides water retention for passive irrigation, helping to build a perched water table in the above soil profile for the vegetation to flourish during prolonged dry periods.

RainSmart Drainage Cell is made from recycled polypropylene and is inert to soil borne chemicals and bacteria. RainSmart cells shallow and effective drainage profile helps landscapes to make use of mature plants on roof gardens that need soil depth and water retention properties.

High summer temperatures can cause thermal expansion in concrete and can cause waterproofing to crack. The unique design of the RainSmart Drainage Cell system and void properties helps this heat to escape, reducing the risk of cracking and so enhancing the life of buildings.

This product is environmentally friendly, made from selected recycled polypropylene that recharges the groundwater table through the principle of infiltration when used on any natural ground surface.

Deck loads are reduced, weighing only 3.2 kg/sqm compared to 250 kgs/sqm of gravel for the same effective drainage.

RainSmart Drainage Cell provides a cost-effective and easy to install choice over alternative and traditional aggregate drainage layers used in retaining wall applications. It will reduce the thickness by up to 75% owing to the high void ratio of the RainSmart cell. It is also a lot simpler and faster to install, allowing large areas to be prepared for backfilling without the need to import different aggregates (backfill and drainage aggregate) into the same backfilling process.


  • High compressive load carrying capacity of up to 140 tons/m²
  • High lateral flow capacity
  • Maintains actual void size for effective drainage after backfill and compaction
  • It is thin. The depth of cover is reduced and the use of mature planting in shallow conditions is enabled
  • Holds and creates a perched water table, providing ideal moist conditions for plant growth
  • Reduces hydrostatic forces upon sub-grade walls
  • Alternative to costly and heavy drainage aggregate saving in cost and reducing weight on building structures in roof gardens




RainSmart 30mm Drainage Cell (Plates)

0.6m x 0.5m


RainSmart 50mm Drainage Cell (Plates)

0.6m x 0.5m

Featured Project

Auckland Heliport Gas Venting – RainSmart Drainage Cell

Drainage Solution

Related Products

RainSmart® Stormwater Modules

The RainSmart modular tank system is suited for subsurface, infiltration, retention and detention stormwater applications. This system allows the designer to efficiently control the build up of sediments in the tank and allows for flushing of the system if ever required.

DuraForce™ AS Series Nonwoven Geotextile

DuraForce AS series geotextiles are manufactured and tested to exact quality standards and rated according to the NZTA F/7 specification for geotextiles. Available in a range of grades depending on the particular engineering application required.

Triton Solutions – Underground Stormwater Management

The Triton Stormwater system is suited for subsurface stormwater management including infiltration, retention, detention and conveyance. It is essential to properly contain sediments, contaminants, and surface runoff in order to meet environmental regulations and create world-class projects.

Armourflow™ Panel Drain

Armourflow protects waterproofing coatings and channels water efficiently to the drainage system, preventing hydrostatic pressure build up.

Related Case Studies

View All

Five Mile Retail Development – Triton Stormwater System

25 Feb 2016

The Five Mile retail development site is part of the rapidly expanding Frankton Flats development in the Queenstown. Constructing such a massive commercial development on silty soils meant it was essential to utilise a proven stormwater management system.

Read more

LIC – Triton Stormwater System

20 Feb 2016

When LIC (Livestock Improvement Centre), a rapidly expanding farmer-owned co-operative and an employer of 2000 staff needed to grow its Head Office Carpark in Newstead Hamilton, there was no option other than to develop the space where the current stormwater pond for the site was situated.

Read more

Queens Park Development – RainSmart® Stormwater System

11 Feb 2016

This innovative RainSmart® design in Hamilton was set up to make full use of the RainSmart linear access system.

Read more